跪求大牛指点GWD-5-Q32:

chaizhi

Which of the following most logically completes the argument?

 

Although the pesticide TDX has been widely used by fruit growers since the early 1960’s, a regulation in force since 1960 has prohibited sale of fruit on which any TDX residue can be detected.  That regulation is about to be replaced by one that allows sale of fruit on which trace amounts of TDX residue are detected.  In fact, however, the change will not allow more TDX on fruit than was allowed in the 1960’s, because ______.

 

1. pre-1970 techniques for detecting TDX residue could detect it only when it was present on fruit in more than the trace amounts allowed by the new regulations

本题选择A，但本人愚钝之极，没有把A读懂，请大牛指点

rayhwung88

A也就是说，由于新的dectect技术使标准更高了~~~

所以新技术dectect到更多的residue对于消费者来说无害。

伊布拉莫维琨

anistonlucky

A explains why the amount of pesticide is not going up while the regulation is loosen.

this discrepancy is

when the regulation is loosen to allow sales of fruit with limited pesticide, correspondingly the pesticide should go up.

but the conclusion is it will be the same as before.

only because A---the technology can't fully detect the pesticide which is lower than the limited amount later. in this case, they say there are no pesticide fruit, but that's not true, in fact, there are more than reported.